Walkthrough. All bonus objectives, intel.
This mission is REALLY tough without a bit of "map awareness".
If you follow this video, you'll find it a LOT easier!
First we do the first part of the mission and blow up the two objective buildings, pretty straight forward.
Then, the key is to fly NORTH with the Shadow Teams and take out GDI's Power, Airfields, and eventually Barracks. We do this while building our base and a strike force composed of Scorpions so we can take out the War Factories.
Once GDI's defenses and production structures are dealt with as per above, we finally fly our Saboteurs to the objective buildings and complete the mission with plenty of time to spare for the Bonus Objective.